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sensors Mode-S transponder

A0E23B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N156U · operated by UTAH STATE UNIVERISTY

Hex
A0E23B
Octal
50161073
Decimal
10,543,675
Country
US
Tail
N156U
Type
DA40
No current signal · last broadcast 21d ago
Flights observed
190
Distinct callsigns
1
Country
US
Last broadcast
21d ago

Last known position

Most recent position reported by Mode-S A0E23B.

Country allocation

The ICAO 24-bit address A0E23B falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
N156U - 190 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N156U LGU → LGU Jul 14, 14:55 UTCJul 14, 17:55 UTC3h 0m
2026-07-13 N156U - Jul 13, 18:50 UTCJul 13, 19:05 UTC15m
2026-07-13 N156U - Jul 13, 17:45 UTCJul 13, 18:15 UTC30m
2026-07-13 N156U LGU → LGU Jul 13, 15:30 UTCJul 13, 17:00 UTC1h 30m
2026-07-12 N156U LGU → LGU Jul 12, 04:25 UTCJul 12, 05:50 UTC1h 25m
2026-07-11 N156U - Jul 11, 17:25 UTCJul 11, 19:10 UTC1h 45m
2026-07-11 N156U - Jul 11, 16:45 UTCJul 11, 16:55 UTC10m
2026-07-11 N156U - Jul 11, 15:50 UTCJul 11, 16:05 UTC15m
2026-07-11 N156U - Jul 11, 02:20 UTCJul 11, 02:45 UTC25m
2026-07-11 N156U - Jul 11, 01:30 UTCJul 11, 01:40 UTC10m
2026-07-10 N156U LGU → LGU Jul 10, 15:40 UTCJul 10, 18:00 UTC2h 20m
2026-07-09 N156U - Jul 9, 19:00 UTCJul 9, 19:20 UTC20m
2026-07-09 N156U - Jul 9, 18:00 UTCJul 9, 18:25 UTC25m
2026-07-09 N156U - Jul 9, 16:30 UTCJul 9, 16:50 UTC20m
2026-07-09 N156U - Jul 9, 14:10 UTCJul 9, 14:15 UTC5m
2026-07-08 N156U LGU → LGU Jul 8, 22:50 UTCJul 8, 23:15 UTC25m
2026-07-08 N156U LGU → LGU Jul 8, 18:50 UTCJul 8, 19:45 UTC55m
2026-07-08 N156U - Jul 8, 17:00 UTCJul 8, 17:20 UTC20m
2026-07-08 N156U - Jul 8, 15:00 UTCJul 8, 15:15 UTC15m
2026-07-07 N156U LGU → LGU Jul 7, 18:30 UTCJul 7, 19:40 UTC1h 10m
2026-07-07 N156U - Jul 7, 15:45 UTCJul 7, 15:55 UTC10m
2026-07-07 N156U - Jul 7, 14:55 UTCJul 7, 15:00 UTC5m
2026-07-06 N156U LGU → LGU Jul 6, 15:25 UTCJul 6, 16:45 UTC1h 20m
2026-07-02 N156U LGU → LGU Jul 2, 18:25 UTCJul 2, 19:50 UTC1h 25m
2026-07-02 N156U - Jul 2, 17:00 UTCJul 2, 17:15 UTC15m
2026-07-02 N156U - Jul 2, 15:05 UTCJul 2, 15:15 UTC10m
2026-07-02 N156U LGU → LGU Jul 2, 05:00 UTCJul 2, 05:55 UTC55m
2026-07-02 N156U LGU → LGU Jul 2, 00:25 UTCJul 2, 02:00 UTC1h 35m
2026-07-01 N156U - Jul 1, 20:35 UTCJul 1, 21:20 UTC45m
2026-07-01 N156U - Jul 1, 19:25 UTCJul 1, 19:45 UTC20m
2026-07-01 N156U - Jul 1, 18:30 UTCJul 1, 18:50 UTC20m
2026-07-01 N156U - Jul 1, 17:25 UTCJul 1, 17:45 UTC20m
2026-07-01 N156U - Jul 1, 15:35 UTCJul 1, 16:40 UTC1h 5m
2026-07-01 N156U LGU → LGU Jul 1, 13:10 UTCJul 1, 14:05 UTC55m
2026-07-01 N156U LGU → LGU Jul 1, 03:55 UTCJul 1, 06:20 UTC2h 25m
2026-06-30 N156U LGU → LGU Jun 30, 19:00 UTCJun 30, 20:05 UTC1h 5m
2026-06-30 N156U - Jun 30, 16:50 UTCJun 30, 18:00 UTC1h 10m
2026-06-30 N156U - Jun 30, 16:00 UTCJun 30, 16:05 UTC5m
2026-06-30 N156U - Jun 30, 15:05 UTCJun 30, 15:30 UTC25m
2026-06-30 N156U - Jun 30, 06:20 UTCJun 30, 06:30 UTC10m
2026-06-30 N156U - Jun 30, 04:35 UTCJun 30, 04:40 UTC5m
2026-06-29 N156U LGU → LGU Jun 29, 23:54 UTCJun 30, 01:45 UTC1h 51m
2026-06-29 N156U LGU → LGU Jun 29, 20:09 UTCJun 29, 21:39 UTC1h 30m
2026-06-29 N156U - Jun 29, 16:00 UTCJun 29, 16:29 UTC30m
2026-06-29 N156U - Jun 29, 15:09 UTCJun 29, 15:19 UTC10m
2026-06-25 N156U LGU → LGU Jun 25, 15:34 UTCJun 25, 16:59 UTC1h 25m
2026-06-24 N156U - Jun 24, 18:39 UTCJun 24, 19:10 UTC30m
2026-06-24 N156U - Jun 24, 16:14 UTCJun 24, 16:45 UTC30m
2026-06-23 N156U LGU → LGU Jun 23, 15:30 UTCJun 23, 17:39 UTC2h 10m
2026-06-22 N156U - Jun 22, 20:04 UTCJun 22, 20:34 UTC30m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N156U page for operator, model, and routing details .

Mode-S A0E23B frequently asked

What is Mode-S code A0E23B?
A0E23B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N156U.
Where is Mode-S A0E23B registered?
Mode-S code A0E23B is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A0E23B broadcasting right now?
No active broadcast right now. Last signal was 21d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0E23B, octal 50161073, decimal 10,543,675.
What flights does A0E23B operate?
Mode-S A0E23B has broadcast 1 distinct callsign, including N156U.